[stm32f429i-discovery] Added miniblink example.

examples/stm32/f4/stm32f429i-discovery/miniblink/Makefile

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+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = miniblink
+
+LDSCRIPT = ../stm32f429i-discovery.ld
+
+include ../../Makefile.include
+

examples/stm32/f4/stm32f429i-discovery/miniblink/README

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+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is the smallest-possible example program using libopencm3.
+
+It's intended for the ST STM32F429IDISCOVERY eval board. It should blink
+the GREEN LED on the board.
+
+Board connections:
+------------------
+
+ <none required>

examples/stm32/f4/stm32f429i-discovery/miniblink/miniblink.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+static void gpio_setup(void)
+{
+	/* Enable GPIOD clock. */
+	/* Manually: */
+	// RCC_AHB1ENR |= RCC_AHB1ENR_IOPGEN;
+	/* Using API functions: */
+	rcc_periph_clock_enable(RCC_GPIOG);
+
+	/* Set GPIO13 (in GPIO port G) to 'output push-pull'. */
+	/* Manually: */
+	// GPIOG_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << 2);
+	// GPIOG_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << 2);
+	/* Using API functions: */
+	gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13);
+}
+
+int main(void)
+{
+	int i;
+
+	gpio_setup();
+
+	/* Blink the LED (PG13) on the board. */
+	while (1) {
+		/* Manually: */
+		// GPIOG_BSRR = GPIO13;		/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// GPIOG_BRR = GPIO13;		/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API functions gpio_set()/gpio_clear(): */
+		// gpio_set(GPIOG, GPIO13);	/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// gpio_clear(GPIOG, GPIO13);	/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API function gpio_toggle(): */
+		gpio_toggle(GPIOG, GPIO13);	/* LED on/off */
+		for (i = 0; i < 1000000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+	}
+
+	return 0;
+}